Q. C# Program to Find Factorial of a Given Number.

Here you will find an algorithm and program in C# programming language to find factorial of a number. First let us understand what factorial means.

Explanation : The factorial of a number is the product of all the integers from 1 to that number.

For Example : Factorial of 5 is 120 i.e. 5*4*3*2*1

START
step 1 : Read the number n
step 2 : [Initialize]
         i=1, fact=1
step 3 : Repeat step 4 through 6 until i=n
step 4 : fact=fact*i
step 5 : i=i+1
step 6 : Print fact
STOP

C# Program to Find Factorial of a Number

using System;  
public class LFC  
{  
  public static void Main(string[] args)  
  {  
    int i,fact=1,num=7;      
    for(i=1;i<=num;i++)
    {      
      fact=fact*i;      
    }      
    Console.Write("Factorial of " +num+" = "+fact);    
  }  
}  

Output

Factorial of 7 = 5040